It's old, isn't it.
http://www.nintendoworldreport.com/news/48468/meltan-unveiled-first-generation-viii-pokemon
A recent addition to Pokémon Go appears to be the first Pokémon ever unveiled in the game.
During special events this past weekend, an unidentified Pokémon appeared that would actually be revealed as a Ditto if captured. The Pokémon Company has released a video containing a conversation with Professors Oak and Willow confirming its name as Meltan.
The upcoming Let's Go series of Pokémon games have said there will be a new Pokémon in them, though Meltan's status of a "mythical" Pokémon in the style of Mew means its actual method for obtaining and using in Pokémon games has yet to be announced. It is confirmed as a Steel type.
Let's Go Pikachu and Eevee are still Generation 7 games.
Good, now the internet can stop calling him “Nutto.”
That's flat-out a Banjo-Kazooie Honeycomb with an eye. Apparently, that's all the creativity it takes to create a Pokemon nowadays. That and a set of keys, apparently.
If you insist. Game Freak outright stated that Generation 8 would begin with the 2019 mainline game and that Let's Go Pikachu and Eevee are just spinoffs. However that doesn't mean Meltan is not a generation 8 pokemon. There is a precedent for pokemon from future generations appearing in spinoff games.
